Illenial It's recommended to instead report app bugs to respective app developers and ask for real time support in GrapheneOS Matrix chat for the said app bugs, or report upstream AOSP bugs at issuetracker.google.com. Instructions are found at https://developer.android.com/studio/report-bugs
If sandboxed Play services is used, make sure it's correctly installed, in proper order, in accordance to this usage guide here: https://grapheneos.org/usage#sandboxed-google-play-installation. Downgrading is not officially supported nor recommended because Android 12 Pixel does not have full security fixes, nor Google provide long term support branch for it, as stated in this twitter thread: https://twitter.com/GrapheneOS/status/1564313581386088449#m , or this nitter mirror alternatively, https://nitter.net/GrapheneOS/status/1564313581386088449#m.